Taxes in a DCF

I am looking through Rosenbaum & Pearl's DCF and they use the Marginal Tax rate of 38% in both the DCF even to calculate historical NOPAT. If I were doing a DCF on a company like Microsoft which had a effective tax rate of 16.5% in FY 2020, would it be incorrect to use this tax rate for the DCF and WACC? Does it make any difference which tax rate you use (marginal vs effective) if it is more of a mature company like Microsoft?

8 Comments
 

Effective tax rate is what they actually pay. This will differ from marginal because they could be using tax credits, have one-time losses embedded, etc. The definition of marginal tax rate is the tax $ that you would pay on the incremental $1 of income.

That new 21% tax rate applies to the US only. If they have a slightly lower effective tax rate (save any funky losses, one-time items, etc), it's probably because they have global operations, where the other countries they operate in have a lower tax rate. Read the footnotes of the 10-K and see what they say. My guess would be using the 16.5% would make more sense, as presumably that 16.5% is lower not because of one-time items, but because they do business in countries where the tax rate is naturally lower than 21%.

 

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